How to tell if a AC Capacitor is Bad! Visual and Multimeter Testing!

WEBVTT
Kind: captions
Language: en

00:00:04.250
hey guys this is AC so respected today
00:00:06.950 00:00:06.960 what I wanted to go over was what does a
00:00:09.080 00:00:09.090 back pasture look like alright this
00:00:11.720 00:00:11.730 particular capacitor was just pulled out
00:00:13.549 00:00:13.559 of the 27 year old Florida heat pump I
00:00:15.620 00:00:15.630 just found this the other night and it
00:00:17.540 00:00:17.550 was leaking the dielectric solution all
00:00:20.210 00:00:20.220 outside of the capacitor alright so the
00:00:22.849 00:00:22.859 fluid is actually coming out and all
00:00:25.099 00:00:25.109 over the place alright so you don't even
00:00:27.349 00:00:27.359 need to test that that is bad just make
00:00:29.359 00:00:29.369 sure you turn the power off you
00:00:30.410 00:00:30.420 disconnect it and you replace it with
00:00:32.120 00:00:32.130 Lakes Lake style capacitor with the same
00:00:36.080 00:00:36.090 rating right this particular capacitor
00:00:39.590 00:00:39.600 right here if you can make that out it's
00:00:42.139 00:00:42.149 actually get like a mushroom top so
00:00:43.850 00:00:43.860 basically the middle of it is pointed up
00:00:47.569 00:00:47.579 right here alright whenever you see that
00:00:50.709 00:00:50.719 that is a bad capacitor as well or when
00:00:54.049 00:00:54.059 it's on its way out another thing that
00:00:56.240 00:00:56.250 you might see is you might see a all wet
00:00:58.639 00:00:58.649 on the top right here and if nothing
00:01:00.560 00:01:00.570 else is wet and the inside of it that
00:01:02.360 00:01:02.370 much will compartment and it should not
00:01:04.369 00:01:04.379 be then that capacitor is on its way out
00:01:07.250 00:01:07.260 but this one has a mushroom top as well
00:01:09.350 00:01:09.360 all right but it's just starting okay so
00:01:14.390 00:01:14.400 those are all bad capacitors this one
00:01:16.969 00:01:16.979 looks just find them all right so so you
00:01:21.350 00:01:21.360 wouldn't have any visual on this telling
00:01:23.840 00:01:23.850 you that it's bad so we're going to go
00:01:25.880 00:01:25.890 ahead and test this one out all right
00:01:28.370 00:01:28.380 this one is a forty plus five uf
00:01:31.880 00:01:31.890 capacitor it's a 370 V AC all right so
00:01:35.840 00:01:35.850 put your multimeter to MFD and you can
00:01:41.179 00:01:41.189 short these at you want to short out not
00:01:43.399 00:01:43.409 necessarily to drink all the voltage out
00:01:45.289 00:01:45.299 because all of it for the most part
00:01:46.850 00:01:46.860 should mainly be drained out from the
00:01:49.670 00:01:49.680 last time the unit was turned off the
00:01:51.530 00:01:51.540 compressor and fan will drawl most of
00:01:54.590 00:01:54.600 the voltage out already but if there's
00:01:56.389 00:01:56.399 just a little bit remaining we're going
00:01:58.340 00:01:58.350 to short that just to make sure we have
00:02:00.200 00:02:00.210 an accurate measurement with our
00:02:01.459 00:02:01.469 multimeter the start capacitors the
00:02:03.709 00:02:03.719 black capacitors those are the ones that
00:02:06.139 00:02:06.149 would actually have voltage in them
00:02:07.999 00:02:08.009 because they're cut out by relay while
00:02:11.570 00:02:11.580 the unit's running
00:02:12.630 00:02:12.640 but the capacitors normal run capacitors
00:02:15.710 00:02:15.720 typically have the voltage drained out
00:02:18.240 00:02:18.250 of them when the unit is shut off but
00:02:21.030 00:02:21.040 just to confirm that we're always safe
00:02:22.830 00:02:22.840 and everything we just scrape this and
00:02:24.540 00:02:24.550 to make sure that our we're getting good
00:02:28.440 00:02:28.450 reading with our multimeter so common to
00:02:31.050 00:02:31.060 fan we should get five so here you
00:02:36.510 00:02:36.520 should get five and left it you want to
00:02:40.680 00:02:40.690 press your probes down real nice and
00:02:42.270 00:02:42.280 hard
00:02:42.770 00:02:42.780 alright and you see we are actually
00:02:45.120 00:02:45.130 getting nope there we go
00:02:47.400 00:02:47.410 point eight seven and see wanna leave
00:02:50.820 00:02:50.830 your probes on there for maybe ten
00:02:52.500 00:02:52.510 seconds press mineral or you know five
00:02:54.479 00:02:54.489 to ten seconds make sure you making a
00:02:55.890 00:02:55.900 good electrical connection and that is
00:02:58.770 00:02:58.780 nowhere near five MFT alright so it can
00:03:03.660 00:03:03.670 be within five to six percent often it
00:03:06.660 00:03:06.670 would still be okay so now we're going
00:03:08.220 00:03:08.230 to go from home to common okay so we did
00:03:10.949 00:03:10.959 fan to common and now we're going to go
00:03:12.660 00:03:12.670 home to come alright
00:03:23.340 00:03:23.350 once again you know you want to give it
00:03:25.720 00:03:25.730 enough time to make sure you're reading
00:03:28.240 00:03:28.250 the capacity we have 39.2 all right so
00:03:35.940 00:03:35.950 39.2 is within six percent of what this
00:03:40.900 00:03:40.910 capacitor is calling for so that side is
00:03:43.570 00:03:43.580 still good but it's very very likely to
00:03:47.080 00:03:47.090 fail very soon from now so you're going
00:03:51.040 00:03:51.050 to replace this with another dual run
00:03:52.990 00:03:53.000 capacitor that is 40 + 5 UF where you
00:03:56.350 00:03:56.360 can replace it with a single capacitor
00:03:59.170 00:03:59.180 that's 40 UF and then another single
00:04:01.540 00:04:01.550 capacitor that's 5 you have you know
00:04:03.100 00:04:03.110 five meaning for the fan and 40 for the
00:04:05.200 00:04:05.210 medically sealed compressor all right
00:04:08.050 00:04:08.060 regardless of whether that's a scroll or
00:04:10.210 00:04:10.220 a reciprocating right herm means
00:04:13.690 00:04:13.700 compressor fan is talking about to come
00:04:16.770 00:04:16.780 the condenser fan on top of the outdoor
00:04:20.110 00:04:20.120 unit and then common is this attached to
00:04:22.630 00:04:22.640 one of your 120 volt legs and you have
00:04:24.610 00:04:24.620 220 volt legs and make your 240 volt
00:04:27.810 00:04:27.820 power for your outdoor unit all right so
00:04:30.880 00:04:30.890 you're going to make sure you do all
00:04:31.720 00:04:31.730 that with the power off and the wires
00:04:33.430 00:04:33.440 isolated off the capacitor that's how
00:04:36.130 00:04:36.140 you'd up hope you enjoy yourself we'll
00:04:38.020 00:04:38.030 see you next time a c7 section
Office location
Engineering company LOTUS®
Russia, Ekaterinburg, Lunacharskogo street, 240/12

Phone: +7 343 216 77 75

E-mail: info@lotus1.ru

Sales phone

Russia: +7 343 216 77 75

WhatsApp: +79122710308